I think we have to think about the reality of this statement.
Absent a 3rd team, I'm pretty sure that the 76ers don't want Fox. He doesn't really fit with Embiid, and Maxey giving them some of what Fox offers. Is Fox an upgrade in Indiana? Sure. But...does he make the Pacers competitive. But are the Pacers more competitive with Fox/Sabonis, or with Fox/Turner? Additionally, if Fox/Turner is an upgrade for the Pacers, they would assuredly upgrade the roster here in Sacramento as well. Which, means to me, that I would try for Turner over Sabonis.
I like Sabonis, but I don't think he's a fit, regardless of availability. If we switch him and Fox, then we're (as some have already mentioned) simply rearranging deck chairs on the Titanic.